Tests of ocean-tide models by analysis of satellite-to-satellite range measurements: an update

Seven years of GRACE intersatellite range-rate measurements are used to test the new ocean tide model FES2014 and to compare against similar results obtained with earlier models. These qualitative assessments show that FES2014 represents a marked improvement in accuracy over its earlier incarnation, FES2012, with especially notable improvements in the Arctic Ocean for constituents K-1 and S-2. Degradation appears to have occurred in two anomalous regions: the Ross Sea for the O-1 constituent and the Weddell Sea for M-2.